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fix behavior when VM_MAXUSER_ADDRESS == (-UPAGES * NBPG)

This commit is contained in:
cgd 1993-06-21 10:18:20 +00:00
parent 05f50ca11e
commit 0e761b8d7e
1 changed files with 4 additions and 4 deletions
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8
sys/vm/vm_glue.c
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)vm_glue.c 7.8 (Berkeley) 5/15/91
* $Id: vm_glue.c,v 1.3 1993/05/20 03:59:22 cgd Exp $
* $Id: vm_glue.c,v 1.4 1993/06/21 10:18:20 cgd Exp $
*
*
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
@ -120,9 +120,9 @@ useracc(addr, len, rw)
* only used (as an end address) in trap.c. Use it as an end
* address here too.
*/
if ((vm_offset_t) addr >= VM_MAXUSER_ADDRESS + UPAGES * NBPG
|| (vm_offset_t) addr + len > VM_MAXUSER_ADDRESS + UPAGES * NBPG
|| (vm_offset_t) addr + len <= (vm_offset_t) addr)
if ((vm_offset_t) addr > VM_MAXUSER_ADDRESS + (UPAGES * NBPG - 1)
|| (vm_offset_t) addr + (len-1) > VM_MAXUSER_ADDRESS + (UPAGES * NBPG - 1)
|| (vm_offset_t) addr + (len-1) < (vm_offset_t) addr)
return (FALSE);
rv = vm_map_check_protection(&curproc->p_vmspace->vm_map,